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            <h1 style="display: none">DOM与IE在事件处理上的区别</h1>
            
            <div class="markdown-body">
              <h3 id="事件模型"><a href="#事件模型" class="headerlink" title="事件模型"></a>事件模型</h3><h4 id="DOM：3个阶段"><a href="#DOM：3个阶段" class="headerlink" title="DOM：3个阶段"></a>DOM：3个阶段</h4><ul>
<li>1.由外向内：捕获</li>
<li>2.触发</li>
<li>3.由内向外：冒泡</li>
</ul>
<h4 id="IE8：2两个阶段"><a href="#IE8：2两个阶段" class="headerlink" title="IE8：2两个阶段"></a>IE8：2两个阶段</h4><ul>
<li>1.触发</li>
<li>2.由内向外：冒泡</li>
</ul>
<p>如图：DOM与IE8事件模型的比较<br><img src='/images/DOM&IE8.png'></p>
<h3 id="事件绑定"><a href="#事件绑定" class="headerlink" title="事件绑定"></a>事件绑定</h3><p>在DOM中：elem.addEventListener(‘click’,function(){},false)<br>注意：第三个参数 capture：是否在捕获阶段就提前触发，默认为false，一般省略；</p>
<p>在IE8中：elem.attachEvent(‘onclick’,function(){})</p>
<h3 id="事件移除"><a href="#事件移除" class="headerlink" title="事件移除"></a>事件移除</h3><p>在DOM中：ele.removeEventListener(‘click’,function(){},false)<br>在IE8中：ele.detachEvent(‘onclick’,function(){})</p>
<h3 id="获得事件对象的方法"><a href="#获得事件对象的方法" class="headerlink" title="获得事件对象的方法"></a>获得事件对象的方法</h3><p>在DOM中：ele.addEventListener(‘click’,function(e){e-&gt;event})<br>在IE8中：不会自动传入时间对象e，事件对象event始终保持在一个全局变量window.event中<br>elem.attachEvent(‘onclick’,function(){ var e = window.event })</p>
<h3 id="获得目标元素"><a href="#获得目标元素" class="headerlink" title="获得目标元素"></a>获得目标元素</h3><p>在DOM中：e.target<br>在IE8中：window.event.srcElement<br>兼容所有浏览器的写法：</p>
<div class="code-wrapper"><pre><code class="hljs javascript"><span class="hljs-keyword">var</span> target = e.target || <span class="hljs-built_in">window</span>.event.srcElement;</code></pre></div>

<h3 id="阻止冒泡"><a href="#阻止冒泡" class="headerlink" title="阻止冒泡"></a>阻止冒泡</h3><p>在DOM中：e.stopPropagation()<br>在IE8中：window.event.cancelBubble = true<br>兼容所有浏览器的写法：</p>
<div class="code-wrapper"><pre><code class="hljs javascript"><span class="hljs-keyword">if</span>(<span class="hljs-built_in">window</span>.event.cancelBubble != <span class="hljs-literal">undefined</span>) &#123;
    <span class="hljs-built_in">window</span>.event.cancelBubble = <span class="hljs-literal">true</span> <span class="hljs-comment">//IE8</span>
&#125;<span class="hljs-keyword">else</span> &#123;
    e.stopProoagation() 
&#125;</code></pre></div>

<h3 id="阻止默认行为"><a href="#阻止默认行为" class="headerlink" title="阻止默认行为"></a>阻止默认行为</h3><p>在DOM中：e.preventDefault()<br>在IE8中：事件处理函数中：window.event.returnValue = false<br>兼容所有浏览器的写法：</p>
<div class="code-wrapper"><pre><code class="hljs javascript"><span class="hljs-keyword">if</span>(<span class="hljs-keyword">typeof</span> e.preventDefault !== <span class="hljs-string">&#x27;function&#x27;</span>) &#123;
   <span class="hljs-built_in">window</span>.event.returnValue = <span class="hljs-literal">false</span> <span class="hljs-comment">//IE8</span>
&#125;<span class="hljs-keyword">else</span> &#123;
    e.preventDefault()
&#125;</code></pre></div>
<h3 id="案例"><a href="#案例" class="headerlink" title="案例"></a>案例</h3><p>定义一个函数，可以支持所有浏览器中的处理函数绑定</p>
<div class="code-wrapper"><pre><code class="hljs javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">bindEvent</span>(<span class="hljs-params">elem, eventName, handler</span>) </span>&#123;
    <span class="hljs-keyword">if</span>(<span class="hljs-keyword">typeof</span> elem.attachEvent!==<span class="hljs-string">&#x27;function&#x27;</span>)&#123;
         <span class="hljs-comment">//DOM</span>
        elem.addEventListener(eventName, handler)
    &#125;<span class="hljs-keyword">else</span>&#123; <span class="hljs-comment">//IE8</span>
         elem.attachEvent(<span class="hljs-string">&#x27;on&#x27;</span>+eventName, <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>)</span>&#123;
             <span class="hljs-comment">//this -&gt; elem</span>
             <span class="hljs-keyword">var</span> e = <span class="hljs-built_in">window</span>.event
             e.target = e.srcElement;
             handler.call(<span class="hljs-built_in">this</span>,e)
         &#125;)
    &#125;
&#125;
bindEvent(btn, <span class="hljs-string">&#x27;click&#x27;</span>, <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">e</span>)</span>&#123;
    <span class="hljs-comment">//this 当前事件冒泡到的父元素</span>
    <span class="hljs-keyword">var</span> target = e.target <span class="hljs-comment">//目标元素</span>
&#125;)
</code></pre></div>
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